Rheostat and controlling device.



H. 1). JAMES. RHEOSTAT AND GONTROLLING DEVICE APPLICATION FILED MAR. 31,1909.

925,341 Patented June 15, 1909.

WITNESSES:

trolling; tiQT w ns or irritates, rauigs i va neisai's'i originaleppiicajioi tiled. pore To all 101mm A a new; and useful improvenieutiiillheostats and Conn-1 ing D lowing is, :1 spccili visi on of my a fil Iiii ices, of which the fola t1on, th s be ng a do pplicatun Se ial30.331279,

21 luv cntio'u relates to rheostat's and cons for electrical circuits,and it. has ;for it object to provide simple and etl'eclive means forgoverning the value and (um-m of the drop 0 potential (in a circuit. I,v y V Electric motors are frequently governed in, speed anddii-ection'of rotation by adjusting the ifkfltagcs applied tothearmature circuitsthereof, and the direction of current ilfm" in. the biits .l (li'ie"iii 'eth )d ct" effect- 'ing thesaidadj'ustiiieiits'consists in altering the strength and polarity of thefield of a generator that supplies the" armature circuit or amotoi', thefield strength being altered by varying the amount of resistance inthefield circuit, and the polarity of the field being altered by reversingthe direction of the drop of potential in the field circuit.

According to the present invention, the means for adjusting .the amountof edective resistance in the field circuit is so constructed-andarranged that it may-also be employed to reverse the direction of thedrop of potential in the circuit without interrup tioii thereof andWithout injury or shock to the machine.

The single figure of the accompanying drawing is a diagrammatic view ofa controller that is constructed and arranged in circuit in accordancewith my invention.

The terminals of a distributing circuit 1-2, which may comprise thefield magnet winding 3 of a dynamo electric machine 4, are connected tothe respective middle points of subdivided resistances 5 and 6, thepoints of subdivision of one-half of the resistance 5 being'connected toa set of terminals 7, and those of the other half to another set ofcontact terminals 8, While the points of subdivision of one-half of theresistance 6 are 1x; int UF iC-TUBDIG ooairiiizfij'aoosroniifrionoEPENNsYLvANniJ a s s ments ementum; nnvic'n,

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,that a re carried at the extremities of a four-- armed movable member15, the brushes 11 and 12 being connected by means of a con- I ductor1G, and brushes 13 .andl by means not a conductor 17. The. conductors l6and it constitute shunts for theportions of the, resistances and (3 thatare ncluded between, the respective pa rs of brushes 1ll2 areconnected'to the middle points of the respective halves of theresistances 5 and 6. 7o

Then, sincefih e brnshes ll and 13 are con iiected to equi-potentialpoints o'f the IQSlSt- 'ances 5 and 6 and .ilso to brushes and 1 noditl'erenceof potential will exist betweenthe terminals oi thefield-magnet Winding 3. If, ho\'vever .-the member 15 is moved in aClOCliWISQ direction, the brushes 11 and 13,

and also 12 and 14, will be connected to points of the resistances and(3 that diti'er? in potential and the points ofthe resistances to whichthe terminals-of the field magnet"- Winding 3 are connected 'will becaused; to' v (litter in potential; The winding then'bo. comesenergized, the voltage applied'thereto increasing asthe controllermemberlfi ap-" 85, proaches the limitof its movement in a clockwisedirection. If the controller member 15 is moved from the position shown,in

a counter-clockwise direction, the brushes 11 and 13, and also thebrushes l2 and 14, will so again become connected to points ofresistances 5 and 6 that differ in potential, and, consequently, themiddle points of the re sistances, to which the terminals of the fieldmagnet Winding?) are connected, will differ in potential and the fieldmagnet winding will become energized, the direction of current flowtherein being reversed. The value of the difference of potential may beincreased as the controller member 15 is conioo tinned in its movementin the "counter-clock Wise direction.

\Vhile specific means have been shown and described, it Will, of course,be understood that the invention is not limited in scope to suchspecific means, or to the specific appli cation which has here beenillustrated and described, and I consequently desire that, it

*be-construed to cover all such modified de- 2. The combination with asuppl circuitand two resistances connected in parallel relation thereto,of a distributing circuit the terminals of which are connected to therespective resistances, and movable shunts for portions of theresistances each of which extends only between points of the sameresistance that are upon opposite sides of the connections of thedistributing circuit thereto.

3. The combination with a supply circuit and two resistancesconnected inparallel relation thereto, of a distributing circuit the terminals ofwhich are connected to the respectiveresistances, shunts for portions ofthe resistances each of which extends only between points of the sameresistance, and

means for moving the said shunts along the resistances toward oppositeterminals thereof.

4. The combination with a supply circuitand two resistances connected inparallel relation thereto, of a. distributing circuitthe terminals ofwhich are connected to the respective resistances, shunts for portionsof the resistances each of which extends only between points of the sameresistance that are upon opposite sides of the connections of thedistributing circuit thereto, and means for moving the said shunts alongthe resistances toward opposite terminals thereof.

5. The combination with a supply circuit and two resistances connectedin parallel relatlon thereto, of a dlstributing circuit the termlnals ofwhich are connected to the respective resistances, and movable shuntsfor one half of each of the resistances.

6. The combination with a supply circuit and two resistances connectedin parallel relation thereto, of a distributing circuit the terminals ofwhich are connected to therespective resistances, and movable shunts forone half of each of the resistances, the said shunts extending betweenthe points of the reslstances that are located upon opposite sides ofthe connections of the distributing circuit thereto.

7 The combination w1th a supp 3 circuit and two resistances connected inparallel relation thereto,-of a distributing circuit the terminals ofwhich are connected to the respective resistances, and shunts for onehalf of each of the resistances that are movable along the samerespectively toward opposite terminals thereof.

8. The combination with a supply circuit and two resistances connectedin parallel relation thereto, of a distributing circuit the terminals ofwhich are connected to the respective resistances, shunts for one haltof each of the res stances that extend betweenpoints of the resistanceslocated up'on opposite sides of the connections of the distributingcircuit thereto, and means for moving the shunts along the resistancestoward opposite terminals thereof. a

In testimony whereof, I have hereunto subscribed my name this 27th dayof March,

HENRY .l').J.-'\1\"Il*lt%.

Witnesses Ross W. Cot-memo, B. l. TTINES.

